Up to now, all amendments have been proposed and implemented as codicils appended to the main body of the Constitution. If at least two-thirds of the legislatures of the states so request, Congress is required to call a convention for the purpose of proposing amendments. This provision, many scholars argue, checks the power of the Congress to limit potential constitutional amendments.
1 The pulmonary veins carry oxygenated blood from the lungs into the left atrium where it is returned to systemic circulation.  The aorta is the largest artery in the body. It carries oxygenated blood from the left ventricle of the heart into systemic circulation.
What is the largest and the main artery of the circulatory system? Pulmonary The main artery of the human circulatory system is called the aorta. It comes directly off of the heart, carrying oxygenated blood to other arteries that carry it to â¦ the body's cells. About the thickness of your thumb, it is also the largest artery.